Radeon X1900 XTX, formerly known as R580, is the new high-end chip from ATI, replacing Radeon X1800 XT as the fastest GPU from ATI. We’ve got a reference sample for this new model from ATI, so we will compare its performance to other members of the Radeon X1000 series, to previous ATI chips and also with competing products from NVIDIA, namely GeForce 7800 GTX.

So far there are two chips on Radeon X1900 family: Radeon X1900 XT, working at 550 MHz and accessing its memory at 1.45 GHz (46.4 GB/s transfer rate), and Radeon X1900 XTX, working at 650 MHz and accessing its memory at 1.55 GHz (49.6 GB/s transfer rate). Both access their memories at 256-bit rate.